User Manual

Table Of Contents
ExpressionMR400InstructionsforUseMonitoringECG55
Selecting the ECG Lead Cable and Quadtrode Electrode Type
ECGleadcablesand Quadtrodeelectrodesareprotonemissionscompliant,willnotdistortthe
MRimage,andaredesignedtoprovidethemaximumpatientsafetyandMRIperformance:
•OnlyusethespecifiedECGleadcableswiththeMR400,asthesearespeciallyconstructed
toavoidpatientheatingbyreducingtheamount
ofradiofrequency(RF)energythatcan
flowthroughthe wiresandwithashorterlengthtoreducethepotentialforcablelooping.
ThetypeofleadcableneededwilldependuponthetypeofQuadtrodeelectrodebeing
used.
•OnlyusethespecifiedQuadtrodeelectrodewiththeMR400,asthiswill
minimizethe
possibleriskofelectrodeheatingduringMRIproceduresandreducetheamountofMRI
generatedartifactsontheECGwaveform.ThetypeofQuadtrodeelectrodeneededwill
dependgenerallyuponthepatienttype,gen derandweight.(Regardlessofthetype,the
Quadtrodeelectrodewillbeconsideredasingle
itemwhendiscussedinthistext.)
11 BeginscansequenceandobservetheECGwaveform.
IftheECGwaveformbecomescompromisedduringscanning,then
changetheleadviewand/ortheFilterModeontheMR400.
Note
ECG performance during MRI scanning can be further improved by
modifying scan sequence parameters at the MRI console. Changing
any of these parameters directly alters image quality so precaution
must be taken to not overwhelmingly affect the desired image
characteristics:
Increase TE (Echo Time)
Increase TR (Repetition Time)
Increase TI (Inversion Time)
Increase / change the imaging plane (for example, sagittal to
axial)
Turn off fat suppression
Decrease the PNS level
Decrease the gradient strength
12 Afterscanning,disconnectthewECGmodulefromthepatient.
ThenstorethewECGmoduleinthemoduleholder.Loopthecable
trunkwithfoaminsulatorthensecureitusingtheVelcrostorage
straptokeeptheexcesscablelengthfromtouchingthefloor;see
page212.
Step Action